Electrically tunable pulse laser for coherent laser radar
A pulsed laser and lidar technology, applied in the laser field, can solve the problems of high price, light leakage of radar systems, insufficient extinction ratio of switching light, etc., and achieve the effects of low cost, improved signal-to-noise ratio, and reduced complexity.
Active Publication Date: 2022-06-21
武汉镭晟科技有限公司
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[0004] However, the inventors of the present invention have found that the existing coherent lidar generates pulse signals through acousto-optic modulators, that is, in the case of a continuous light source, the pulse signals are formed by turning on and off the light at a certain frequency, which is expensive , and the insufficient extinction ratio of the switching light will lead to the common light leakage phenomenon in the radar system
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[0048] Mode dispersion: During multimode transmission, each mode of the fiber is at the same wavelength, due to the different tangent components of the transmission constant and the dispersion caused by the different group velocities. In a multimode fiber, rays entering the fiber at different angles form different modes in the fiber. The diagram in the basic structure of an optical fiber shows three meridional rays at different angles. Among them, the ray transmitted along the axis is the lowest submode, and its tangential transmission speed (namely group velocity) is the fastest, and it reaches the terminal first. The ray transmitted along the angle that just produces total reflection is the highest order mode, and the transmission speed in the tangential direction is the slowest, and reaches the terminal at the latest. There are differences in the time they arrive at the terminal, and this time difference or delay difference between modes is called modal dispersion, or inte...
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The invention discloses an electrically tunable pulse laser for a coherent laser radar. The electrically tunable pulse laser comprises a modulatable light source, a pulse signal generator, an optical fiber beam splitting module, a pulse broadening discrete module, a first amplification module and an optical fiber circulator. According to the invention, the principle of generating the pulse signal in the laser is changed, the pulse waveform is generated by directly using the electrically-modulated tube core, and the pulse generator is used for directly performing internal modulation on the modulated light source to generate the pulse light signal, so that the complexity of the laser is remarkably reduced, and the cost is also remarkably reduced. Besides, more stable electric pulse signals can be generated by using the pulse signal generator, and the generated electric pulse signals have lower noise floor, so that the signal-to-noise ratio of the system can be improved. According to the invention, the pulse dispersion broadening module or the pulse discrete module is arranged to generate continuous or quasi-continuous local oscillation light so as to meet the requirements of the coherent laser radar on the light source.
Description
technical field [0001] The invention relates to the field of laser technology, in particular to an electrically adjustable pulse laser for coherent laser radar. Background technique [0002] Lidar is an active modern optical remote sensing technology, which is the product of the combination of traditional radar technology and modern laser technology. Laser has the characteristics of high brightness, high directivity, high coherence, and high peak power. Therefore, lidar has the advantages of high angular resolution, high distance resolution, high time resolution, high measurement accuracy, long detection distance, multi-target detection, and strong anti-interference. By using laser as an information carrier, lidar can carry information with amplitude, frequency, phase, and polarization. Therefore, it can not only accurately measure distance, but also accurately measure frequency shift, angle, attitude, and depolarization. Following microwave radar, lidar increases the fre...
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Login to View More IPC IPC(8): G01S7/484G01S7/481
CPCG01S7/484G01S7/4814G01S7/4818Y02A90/10
Inventor 汪家乐王勇胡呈峰白香港兰根书
Owner 武汉镭晟科技有限公司